#include<stdio.h>

#include"mymath.h"
int mul(int a, int b)
{
  return a * b;
}
int main()
{
  int a = 4,b = 2;
  printf("%d+%d = %d\n", a, b, add(a, b));
  printf("%d-%d = %d\n", a, b, sub(a, b));
  printf("%d/%d = %d\n", a, b, div(a, b));
  printf("%d*%d = %d\n", a, b, mul(a, b));

  return 0;
}
